https - sonarqube 4.1.2: unable to evict preview database -

after performing successful analysis, seeing failure "unable evict preview database: /batch_bootstrap/evict?project=10020". followed summary:

[error] failed execute goal org.codehaus.mojo:sonar-maven-plugin:2.5:sonar (default-cli) on project xxx: can not execute sonarqube analysis: unable evict preview database: /batch_bootstrap/evict?project=10020: fail execute request [code=400, url=https://xxx/batch_bootstrap/evict?project=10020]: fail download [https://xxx/batch_bootstrap/evict?project=10020]. response code: 400 -> [help 1]  running on sles11sp1, java 1.7, maven 3.3.  i've tried increasing memory (maven_opts="-xms4096m -xmx8092m -xx:maxpermsize=4096m") , changing ulimit files (8192) have not seen change in failure. 

any hints? code 400?

you should publish properties files analysis configuration, , log file complete. regards.